Alexander litvinenko was poisoned with 10 micrograms of the radioactive substance polonium-210. since radioactive decay follows a compounded continuously model, we can determine the amount of substance left in alexander litvinenko's body at any given time. if polonium-210 has a decay rate of .502%, then determine the amount of polonium-210 left in his body after 85 days

12

step-by-step explanation:

12 + 5 = 17

12x2=24

24-7=17

graph them on a graphing calculator, press 2nd trace. select intersect. hit enter until it says answer. ti 84 works best

step-by-step explanation:

third choice down

step-by-step explanation:

the first inequality is based on the number of adults and campers, and the second inequality is based on the cost of feeding both the adult and the camper.

we know that there is room for 525 people max.   it's ok to have less than 525, but it's not ok to have more than 525, so the inequality is less than or equal to.   the number combination of adults (x) and campers (y) cannot exceed this 525 max.   therefore:

x + y ≤ 525

now we talk about cost.   it costs $9 to feed one adult, so depending upon the number of adults you have (x) depends upon how much it will cost to feed that number of adults.   same with the campers, who cost $5 to feed.   the adults can be represented by 9x and the campers can be represented by 5y.   since the budget cannot exceed 1,200, the second inequality is:

9x + 5y ≤ 1200

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